ardupilot/libraries/AC_PID/AC_HELI_PID.cpp

56 lines
1.8 KiB
C++

// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*-
/// @file AC_HELI_PID.cpp
/// @brief Generic PID algorithm
#include <AP_Math.h>
#include "AC_HELI_PID.h"
const AP_Param::GroupInfo AC_HELI_PID::var_info[] PROGMEM = {
// @Param: P
// @DisplayName: PID Proportional Gain
// @Description: P Gain which produces an output value that is proportional to the current error value
AP_GROUPINFO("P", 0, AC_HELI_PID, _kp, 0),
// @Param: I
// @DisplayName: PID Integral Gain
// @Description: I Gain which produces an output that is proportional to both the magnitude and the duration of the error
AP_GROUPINFO("I", 1, AC_HELI_PID, _ki, 0),
// @Param: D
// @DisplayName: PID Derivative Gain
// @Description: D Gain which produces an output that is proportional to the rate of change of the error
AP_GROUPINFO("D", 2, AC_HELI_PID, _kd, 0),
// @Param: IMAX
// @DisplayName: PID Integral Maximum
// @Description: The maximum/minimum value that the I term can output
AP_GROUPINFO("IMAX", 3, AC_HELI_PID, _imax, 0),
// @Param: FC
// @DisplayName: PID+FF FeedForward Gain
// @Description: FF Gain which produces an output value that is proportional to the current error value
AP_GROUPINFO("FF", 4, AC_HELI_PID, _ff, 0),
AP_GROUPEND
};
float AC_HELI_PID::get_ff(float requested_rate) const
{
return (float)requested_rate * _ff;
}
// This is an integrator which tends to decay to zero naturally
// if the error is zero.
float AC_HELI_PID::get_leaky_i(float error, float dt, float leak_rate)
{
if((_ki != 0) && (dt != 0)){
_integrator -= (float)_integrator * leak_rate;
_integrator += ((float)error * _ki) * dt;
if (_integrator < -_imax) {
_integrator = -_imax;
} else if (_integrator > _imax) {
_integrator = _imax;
}
return _integrator;
}
return 0;
}